Mike Bloomberg is transferring $US18 million ($A31 million) from his presidential campaign to the Democratic National Committee in the largest single such transfer ever.
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It's the latest sign of the billionaire businessman's continued involvement in the race since ending his own campaign this month because of a lacklustre showing in the March 3 primaries.
In those Super Tuesday contests, the former New York City mayor won only one US territory.
Bloomberg's contribution amounts to more than the national party's typical cash balance.
The transfer will help the DNC make up for some of the steep fundraising disadvantage when compared with its Republican counterpart, which routinely has raised tens of millions more than the Democratic organisation throughout election cycles.
One of the world's wealthiest men with a net worth estimated to exceed $US60 billion, Bloomberg promised throughout his campaign that he would help Democrats try to defeat President Donald Trump regardless of how his own White House bid fared.
The Bloomberg campaign, which hired a staff of 2,400 people across 43 states, will also transfer its offices in six pivotal states to the Democratic parties in those states, to help accelerate their hiring and organising.
Those states are Arizona, Florida, Michigan, North Carolina, Pennsylvania and Wisconsin.
Bloomberg had promised staffers when they were hired that they would be paid through November, but earlier this month most of his campaign team was told they had been let go and would be paid only through the end of March.
DNC officials said Bloomberg's money and real-estate transfers would be used to expand the party's 12-state battleground program, with a focus on hiring additional staffers to work in organising and data operations.
DNC Chairman Tom Perez said the support will "help Democrats win up and down the ballot" and "help make sure Donald Trump is a one-term president."
Bloomberg dropped out of the race March 4.
Since then he has given millions of his own money to various Democratic groups and causes.
The DNC's battleground effort targets Arizona, Georgia, Ohio, Florida, New Hampshire, Nevada, North Carolina, Michigan, Pennsylvania, Texas, Virginia and Wisconsin.
It's a mix of states that have flipped back-and-forth between the two parties in recent presidential cycles and a few that have leaned Republican but are expected to be competitive in November.
Australian Associated Press
